1) I never said any of what I mentioned was "proof" of anything. You asked if there was "reliable information to believe that this is OK for your DPF" (your exact words) in regards to the use of diesel additives. I offered what I believed to be reasonably reliable information from a community of individuals whose interests were in the space of looking for and using the best products for their specific vehicles (sound familiar?). I offered the example of someone using a product that is well known to increase the ash content of exhaust not to say that we ought to ignore the need to be careful of that ash content, but rather that these DPFs are definitely engineered to withstand some level of punishment beyond what would be manufacturer recommended for the care and feeding of your car. It is a piece of evidence that suggests it is possible to use something such as an additive, which the producer states is safe for a DPF, when taken in conjunction with other information out there. Is there absolute, 100% definitive proof that everything will be golden? I never said there was, but for some reason, what I choose to do with my car is somehow offensive to you. Obviously if you feel there is evidence that the use of an additive such as Diesel Kleen from Power Service is harmful to the DPF of my car, I would definitely love to see it so that I may do what is best for my car. We are all definitely enthusiasts when it comes to our cars.
2) Let's unpack this point a bit; there's a lot to cover. The Spicer report is definitely an interesting read. I never said it wasn't. The point I was making was that you claimed, assuming diesel additives are safe for the DPF, I would "be much better off with an additive that actually meaningfully enhances lubricity, like Opti-Lube" (your exact words). The only evidence out there that even remotely suggests that claim is true, is the Spicer report. However, assuming you believe the Spicer report to be a completely valid study, look at what product actually reduced the micron wear scar the most. The answer in that study is bio-diesel. Beyond that, a simple Google search for "lubricity of biodiesel" will bring up numerous scholarly articles that consistently show the use of biodiesel, whether running it straight or as an additive to regular diesel fuel, will significantly increase the lubricity of the fuel. Here's a few links to get you started:
http://www.sciencedirect.com/science/article/pii/S0016236108004766
http://pubs.acs.org/doi/abs/10.1021/ef049684c
http://cat.inist.fr/?aModele=afficheN&cpsidt=15106716
Now, one of the main issues that has been raised with Spicer report is that the testing they did was on raw, untreated diesel fuel from the refinery. Why does that matter? The reason is that this type of fuel is not the fuel that regular people would be purchasing to power their cars. As such, a study that relies on the treatment of raw fuel isn't directly applicable to real world driving. It is definitely possible that the results could have been different due to the fact that the chemistry can change when using an additive such as Opti-Lube or Power Service in retail fuel that already contains some sort of lubricity conditioners but alas, I am not a chemical engineer and cannot say for sure. What the report does suggest is that the use of an additive can significantly increase the lubricity of your fuel, but it cannot definitively claim one winner over the other due to the way the study was conducted. Additionally, the testing of the additives in the Spicer report wasn't exactly 100% "unbiased" as one may think. It is from as you might say "some anonymous internet-source". Furthermore, all of the additives in the study were purchased off the shelf, except for one. Care to guess which? My main point from the very beginning, is that this is only a single piece of evidence that requires further study in order to reach a more conclusive answer. That's problematic when Opti-Lube itself doesn't have data available about the lubricity gains that their product may provide.
Additionally, what is wrong with using data directly from a product producer? Is testing conducted by Mobil 1 engineers suddenly unreliable just because it's their own product? Of course not. I also never suggested that we should take them at their word or at face value. Again, it's a piece of evidence building to a larger answer and as I said before, I prefer more than one set of data. If you'd like to see some additional data on lubricity, here's a link that provides some on Power Service that was provided by them:
http://forums.tdiclub.com/showthread.php?t=196059&highlight=additive
Happy reading.